<template>
    <ul class="todo-main">
        <TodoItem v-for="(todo,index) in todos" :key="index" :index="index" :todo="todo" />
    </ul>
</template>

<script>
    import {mapState} from 'vuex'
    import TodoItem from './TodoItem'
    import storageUtils from '../utils/storageUtils'
    export default {
        name: "TodoList",
        components:{ TodoItem },
        computed:{
            ...mapState(['todos'])
        },
        watch:{  //监视页面
            todos:{
                deep:true,//深度监视
                // handler:function (value) {
                //     //将todos最新的值保存到localStorage中
                //     window.localStorage.setItem('todos_key',JSON.stringify(value))
                // }
                handler:storageUtils.saveTodos
            }
        },
    }
</script>

<style scoped>
    .todo-main {
        margin-left: 0px;
        border: 1px solid #ddd;
        border-radius: 2px;
        padding: 0px;
    }

    .todo-empty {
        height: 40px;
        line-height: 40px;
        border: 1px solid #ddd;
        border-radius: 2px;
        padding-left: 5px;
        margin-top: 10px;
    }



</style>